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/*
* Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/OwnPtr.h>
#include <LibWeb/Forward.h>
#include <LibWeb/Layout/FormattingState.h>
namespace Web::Layout {
class FormattingContext {
public:
virtual ~FormattingContext();
enum class Type {
Block,
Inline,
Flex,
Table,
SVG,
};
virtual void run(Box const&, LayoutMode) = 0;
Box const& context_box() const { return m_context_box; }
FormattingContext* parent() { return m_parent; }
const FormattingContext* parent() const { return m_parent; }
Type type() const { return m_type; }
bool is_block_formatting_context() const { return type() == Type::Block; }
virtual bool inhibits_floating() const { return false; }
static bool creates_block_formatting_context(const Box&);
static float compute_width_for_replaced_element(FormattingState const&, ReplacedBox const&);
static float compute_height_for_replaced_element(FormattingState const&, ReplacedBox const&);
OwnPtr<FormattingContext> create_independent_formatting_context_if_needed(FormattingState&, Box const& child_box);
virtual void parent_context_did_dimension_child_root_box() { }
struct MinAndMaxContentSize {
float min_content_size { 0 };
float max_content_size { 0 };
};
MinAndMaxContentSize calculate_min_and_max_content_width(Layout::Box const&) const;
MinAndMaxContentSize calculate_min_and_max_content_height(Layout::Box const&) const;
float calculate_fit_content_height(Layout::Box const&, Optional<float> available_height) const;
float calculate_fit_content_width(Layout::Box const&, Optional<float> available_width) const;
virtual float greatest_child_width(Box const&);
protected:
FormattingContext(Type, FormattingState&, Box const&, FormattingContext* parent = nullptr);
float calculate_fit_content_size(float min_content_size, float max_content_size, Optional<float> available_space) const;
FormattingState::IntrinsicSizes calculate_intrinsic_sizes(Layout::Box const&) const;
OwnPtr<FormattingContext> layout_inside(Box const&, LayoutMode);
void compute_inset(Box const& box);
struct SpaceUsedByFloats {
float left { 0 };
float right { 0 };
};
struct ShrinkToFitResult {
float preferred_width { 0 };
float preferred_minimum_width { 0 };
};
static float tentative_width_for_replaced_element(FormattingState const&, ReplacedBox const&, CSS::Length const& width);
static float tentative_height_for_replaced_element(FormattingState const&, ReplacedBox const&, CSS::Length const& height);
static float compute_auto_height_for_block_formatting_context_root(FormattingState const&, BlockContainer const&);
static float compute_auto_height_for_block_level_element(FormattingState const&, Box const&);
static float compute_intrinsic_height(FormattingState const& state, Box const& box);
ShrinkToFitResult calculate_shrink_to_fit_widths(Box const&);
void layout_absolutely_positioned_element(Box const&);
void compute_width_for_absolutely_positioned_element(Box const&);
void compute_width_for_absolutely_positioned_non_replaced_element(Box const&);
void compute_width_for_absolutely_positioned_replaced_element(ReplacedBox const&);
void compute_height_for_absolutely_positioned_element(Box const&);
void compute_height_for_absolutely_positioned_non_replaced_element(Box const&);
void compute_height_for_absolutely_positioned_replaced_element(ReplacedBox const&);
Type m_type {};
FormattingContext* m_parent { nullptr };
Box const& m_context_box;
FormattingState& m_state;
};
}
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